The lack of knowledge can get you into trouble.

It sounds like you want their knowledge, but in what areas do you feel you are lacking?  

Then, as you buld knowledge & experience you can do bigger projects.3) The two above strategies can build funds to invest in rentals.

Some impressive features including extensive listing/syndication and state specific guidance provided such as max security deposit.RentRedi is a flat fee for the most part and has some cool features like pre-qualification and integration with QuickBooks.

The best advice on this topic, in my opinion, comes from 2 books:How to win friends and influence peopleNever eat aloneI am also looking for brokerages to work with or even experienced shadow / intern for to gain experience and additional knowledge.

Usually the lender will charge an extension fee to keep the same rate.

@Ibrahim AtoumIf you're starting house hacking at 20, focus on building your knowledge and financial readiness.

The best way to estimate expenses is experience and knowledge of your specific asset type and market.For vacancy, that will depend on your market and the quality/desirability of your type of unit.

However, I have very little knowledge about getting started.

If you desire to get it by all means go for it - knowledge is power - but thats knowledge you pay for that may or may not pay off for you.